US7477273B2 - Method and device for adjusting alignment of image forming apparatus - Google Patents
Method and device for adjusting alignment of image forming apparatus Download PDFInfo
- Publication number
- US7477273B2 US7477273B2 US11/332,314 US33231406A US7477273B2 US 7477273 B2 US7477273 B2 US 7477273B2 US 33231406 A US33231406 A US 33231406A US 7477273 B2 US7477273 B2 US 7477273B2
- Authority
- US
- United States
- Prior art keywords
- thermal print
- medium
- patterns
- print heads
- distance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
- F16L23/22—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of a material other than metal
Definitions
- the present invention relates to a thermal transfer image forming apparatus that prints an image by applying heat to a medium using two thermal print heads. More particularly, the present invention relates to a method and device for adjusting the alignment of an image forming apparatus using the distance between two thermal print heads which has been accurately measured using two patterns printed by simultaneously heating a medium using the two thermal print heads.
- an image forming apparatus converts a document, which a user creates using an application program, or an image, which a user obtains using a digital, camera or the like, into encoded data and outputs the data to media in a visible form.
- a thermal transfer image forming apparatus which is used to obtain a high quality printed image, forms an image by heating an ink ribbon in contact with a medium using a thermal print head and transferring the ink to the medium, or by applying heat to a medium on which an ink layer is formed to reveal a predetermined color in response to heat.
- a thermal image forming apparatus may use two or more thermal printer heads to heat a medium and print a color image. If the thermal print heads face each other with the medium between them, such as an upper thermal print head and a lower print head, the print quality is degraded due to thermal interference between the thermal print heads or an increase of temperature in a specific position. Therefore, the thermal print heads are positioned apart from each other.
- the thermal print heads are positioned apart from each other, however, the positions where the thermal print heads apply heat to print a dot of color are not precisely matched. Therefore, accurate color may not be achieved, and the print quality is degraded.
- an aspect of the present invention is to address at least the above problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention is to provide a method and device for adjusting the alignment of the image forming apparatus using the distance between two thermal print heads which has been accurately measured using two patterns printed by simultaneously heating a medium using the two thermal print heads.
- a method of adjusting the alignment of an image forming apparatus using first and second thermal print heads that apply heat to a medium to print an image comprises the steps of printing first and second patterns by applying heat to the medium using the first and second thermal print heads simultaneously, sensing the first and second patterns using a sensor, calculating the distance between the first and second thermal print heads using the difference between the print positions of the sensed first and second patterns, and adjusting the alignment between the print positions of the first and second thermal print heads using the calculated distance.
- the first thermal print head may print one or two of cyan, magenta and yellow, and the second thermal print head may print the remaining color(s) that the first thermal print head does not print.
- the first thermal print head may apply heat to a first side of the medium
- the second thermal print head may apply heat to a second side of the medium
- the first and second patterns may not overlap, and in printing the first and second patterns, the first and second thermal print heads may start heating the medium at a predetermined point of time and terminate heating the medium when the sensor starts sensing the printed patterns.
- the step of calculating the distance may comprise detecting sensing times of the first and second patterns using an output signal of the sensor that sensed the patterns, calculating the time difference between the detected sensing times of the first and second patterns, and calculating the distance between the first and second thermal print heads by multiplying the calculated time difference by the movement speed of the medium.
- At least one of the print start positions of the first and second thermal print heads is adjusted using the calculated distance.
- a device for adjusting the alignment of an image forming apparatus using first and second thermal print heads that apply heat to a medium to print an image comprises a pattern print unit which prints first and second patterns by applying heat to the medium for a predetermined time period using the first and second thermal print heads simultaneously, a sensor which senses the first and second patterns, a distance calculating unit which detects the difference between the print positions of the first and second patterns using an output of the sensor and calculates the distance between the first and second thermal print heads, and an adjusting unit which adjusts the alignment between the print positions of the first and second thermal print heads using the calculated distance.
- the first thermal print head may print one or two of cyan, magenta and yellow, and the second thermal print head may print the remaining color(s) that the first thermal print head does not print.
- the first thermal print head may apply heat to a first side of the medium
- the second thermal print head may apply heat to a second side of the medium
- the first and second patterns may be printed so as not to overlap.
- the sensor may be positioned such that the distance between the sensor and whichever of the first and second print heads is closer to the sensor is smaller than the distance between the first and second thermal print heads.
- the pattern print unit may start heating the medium at a predetermined point of time using the first and second thermal print heads, and terminate heating the medium when the sensor starts sensing the printed patterns.
- the distance calculating unit may include a memory which stores the output of the sensor, a memory control unit which stores the output of the sensor in the memory, a time detecting unit which detects sensing times of the first and second patterns using the output of the sensor that is stored in the memory, a difference calculating unit which calculates the time difference between the detected sensing times of the first and second patterns, and a calculating unit which calculates the distance between the first and second thermal print heads by multiplying the calculated time difference by the movement speed of the medium.
- the adjusting unit may adjust at least one of the print start positions of the first and second thermal print heads using the calculated distance.
- an image forming apparatus using first and second thermal print heads that apply heat to a medium to print an image comprises a data input unit which receives image data to be printed, a control unit which generates and outputs control signals that control the operation of the first and second thermal print heads using the image data, the first and second thermal print heads, which apply heat to the medium to print an image according to the control signals, and a sensor which senses the image printed on the medium.
- the control unit includes a control signal generating unit which generates control signals such that the first and second thermal print heads simultaneously apply heat to the medium for a predetermined time period to respectively print first and second patterns, a distance calculating unit which detects the difference between the print positions of the first and second patterns using an output of the sensor, and calculates the distance between the first and second thermal print heads, and an adjusting unit which adjusts the alignment between the print positions of the first and second thermal print heads using the calculated distance.
- the first thermal print head may apply heat to a first side of the medium to print one or two of cyan, magenta and yellow, and the second thermal print head may apply heat to a second side of the medium to print the remaining color(s) that the first thermal print head does not print.
- the method of adjusting the alignment of an image forming apparatus can be embodied as a computer readable recording medium having embodied thereon a computer program for executing the above-described method.
- FIG. 1 is a cross-sectional view of a typical thermal reaction medium
- FIG. 2 is a cross-sectional view of the structure of a thermal transfer image forming apparatus having two thermal print heads;
- FIG. 3 is a block diagram of a thermal transfer image forming apparatus according to an exemplary embodiment of the present invention.
- FIG. 4A shows the image forming apparatus of FIG. 3 at the point of starting to print first and second patterns according to an exemplary embodiment of the present invention
- FIG. 4B shows the image forming apparatus of FIG. 3 at the point of terminating the printing of the first and second patterns according to an exemplary embodiment of the present invention
- FIG. 4C shows the first and second patterns printed on the medium according to an exemplary embodiment of the present invention
- FIG. 5 is a block diagram of the distance calculating unit of FIG. 3 according to an exemplary embodiment of the present invention.
- FIG. 6 is a flowchart illustrating a method of adjusting the alignment between thermal print heads according to an exemplary embodiment of the present invention.
- FIG. 7 is a flowchart illustrating the operation of calculating the distance between the thermal print heads of FIG. 6 according to an exemplary embodiment of the present invention.
- FIG. 1 is a cross-sectional view of a typical thermal reaction medium.
- the thermal reaction medium has ink layers of predetermined colors formed on both sides, that is, a first side 10 a and a second side 10 b , of a base 11 .
- the ink layers have different colors. For example, a yellow (Y) layer and a magenta (M) layer are located in that order on the first side 10 a , and a cyan (C) layer is formed on the second side 10 b .
- the base may be a transparent material.
- a reflection layer 13 reflects light such that a color image can be viewed through the first side 10 a .
- FIG. 2 is a cross-sectional view of the structure of a thermal transfer image forming apparatus having two thermal print heads 230 and 210 .
- the image forming apparatus includes a first thermal print head 230 , a second thermal print head 210 , a first platen roller 220 , a second platen roller 240 , a driving motor 280 , a driving roller 270 , an idle roller 260 , and a sensor 250 .
- the first and second thermal print heads 230 and 210 apply heat to a medium 200 to print image data.
- the image data to be printed includes data regarding yellow, magenta and cyan colors, or red, green and blue colors.
- the first thermal print head 230 applies heat to the medium 200 to print the yellow and magenta data
- the second thermal print head 210 applies heat to the medium 200 to print the cyan data.
- the first and second platen rollers 220 and 240 respectively face the first and second thermal print heads 230 and 210 , and support the medium 200 such that the first and second thermal print heads 230 and 210 can heat the medium.
- the first and second platen rollers 220 and 240 rotate as the medium 200 is fed.
- the driving motor 280 is a driving source to supply a medium to be printed to the first and-second thermal print heads 230 and 210 , and rotates the driving roller 270 to feed the medium. While the medium is between the idle roller 260 and the driving roller 270 , the slave roller 260 is engaged with the driving roller 270 and rotated.
- the sensor 250 senses the position of the medium 200 and the patterns printed on the medium 200 . The operation of the sensor 250 will be described below in further detail.
- FIG. 3 is a block diagram of a thermal transfer image forming apparatus according to an exemplary embodiment of the present invention.
- the image forming apparatus includes a data input unit 300 , a control unit 310 , first and second thermal print heads 230 and 210 , and a sensor 250 .
- the control unit 310 includes a control signal generating unit 320 , an adjusting unit 330 , and a distance calculating unit 340 .
- the data input unit 300 receives image data to be printed from a personal computer (PC), a digital camera, a personal digital assistant, or the like.
- PC personal computer
- digital camera digital camera
- personal digital assistant or the like.
- the control unit 310 generates and outputs signals for controlling the operation of the first and second thermal print heads 230 and 210 such that first and second patterns are printed on the medium 200 .
- the first and second thermal print heads 230 and 210 receive the control signals and print the first and second patterns on the medium 200 .
- the sensor 250 senses the first and second patterns printed on the medium 200 and outputs the result as a signal.
- the control unit 310 receives the sensor output signal to calculate the distance between the first and second thermal print heads, and then adjusts the alignment of the print positions of the first and second thermal print heads 230 and 210 according to the distance between the first and second thermal print heads 230 and 210 .
- the second thermal print head 210 first applies heat to the medium to print a dot, and then the first thermal print head 230 preferably applies heat to the medium 200 after the medium 200 has moved as far as the calculated distance between the first and second thermal print heads 230 and 210 .
- control unit 310 After the alignment has been adjusted, the control unit 310 generates control signals according to image data input from the data input unit 300 .
- the first and second thermal print heads 230 and 210 receive the control signals and apply heat to the medium to print an image according to the control signals.
- FIG. 6 is a flowchart of a method of adjusting the alignment of an image forming apparatus.
- the control signal generating unit 320 generates control signals to start driving the first and second thermal print heads 230 and 210 , and the first and second thermal print heads 230 and 210 receive the generated control signals and simultaneously apply heat to the medium 200 to print the first and second patterns (step 600 ).
- the control signal generating unit 320 generates control signals to terminate printing by the first and second thermal print heads 230 and 210 , and each of the first and second thermal print heads 230 and 210 receives the generated control signals, and simultaneously stops heating the medium 200 (step 610 ).
- the printed areas of the first and second patterns do not overlap, to allow the distance between the first and second thermal print heads to be detected using the first and second patterns.
- the start and stop times for heating the medium may be set to control the time period for which the first and second thermal print heads 230 and 210 apply heat to the medium 200 to, for example, prevent overlap of the images.
- FIG. 4A shows the point when the thermal transfer image forming apparatus of FIG. 3 starts printing patterns on the medium 200 according to an exemplary embodiment of the present invention.
- the first and second thermal print heads 230 and 210 simultaneously apply heat to the medium 200 at the point when the driving motor 280 starts rotating the driving roller 270 and moving the medium 200 , or some time thereafter.
- FIG. 4B shows the point when the thermal transfer image forming apparatus of FIG. 3 stops printing the patterns on the medium 200 , according to an exemplary embodiment of the present invention.
- the first and second thermal print heads 230 and 210 simultaneously stop printing the patterns on the medium 200 at the point when the sensor 250 starts sensing the patterns printed on the medium 200 .
- the distance y between the sensor 250 and the first thermal print head 230 is kept smaller than the distance x between the first and second thermal print heads 230 and 210 .
- FIG. 4C shows the first pattern 400 and the second pattern 410 which are printed on the medium 200 according to an exemplary embodiment of the present invention.
- the distance between the start points of the first pattern 400 and the second pattern 410 is the distance between the first and second thermal print heads 230 and 210 .
- the sensor 250 senses the first and second patterns 400 and 410 printed on the medium 200 (step 620 ).
- the sensor 250 may sense the first and second patterns 400 and 410 after steps 600 and 610 are completed, or at the same time as steps 600 and 610 are performed.
- the distance calculating unit 340 receives the sensor output signal and calculates the distance between the first and second thermal print heads 230 and 210 using the sensor output signal (step 630 ).
- the adjusting unit 330 adjusts the alignment between the print positions of the first and second thermal print heads 230 and 210 using the calculated distance between the first and second thermal print heads 230 and 210 (step 640 ).
- the adjusting unit 330 preferably adjusts the print start positions of the first and second thermal print heads 230 and 210 according to the distance between the first and second thermal print heads 230 and 210 .
- FIG. 5 is a block diagram of the distance calculating unit 340 of FIG. 3 .
- the distance calculating unit 340 includes a memory control unit 500 , a memory 510 , a time detecting unit 520 , a difference calculating unit 530 , and a calculating unit 540 .
- the operation of the distance calculating unit 340 will now be described with reference to FIG. 7 , which is a flowchart illustrating a method of calculating the distance between the first and second thermal print heads 230 and 210 using the sensor output signal.
- the memory control unit 500 stores a signal output from the sensor 250 in the memory 510 (step 700 ).
- the time detecting unit 520 reads the sensor output signal from the memory 510 and detects the respective start times or termination times of sensing first and second patterns (step 710 ).
- the difference calculating unit 530 calculates the difference between the detected times of the first and second patterns (step 720 ).
- the difference calculating unit 530 may calculate the difference between the start times of sensing the first and second patterns, the difference between the termination times of sensing the first and second patterns, or the difference between average values of the first and second patterns.
- the calculating unit 540 receives the time difference between the first and second patterns from the difference calculating unit 530 , and multiplies the time difference by the movement speed of the medium 200 , to calculate the distance between the first and second thermal print heads 230 and 210 (step 730 ).
- the calculating unit 540 may receive the sensing start time difference and the sensing termination time difference between the first and second patterns from the difference calculating unit 530 , to calculate two distances between the first and second thermal print heads 230 and 210 , and then average the two distances to calculate the distance between the first and second thermal print heads 230 and 210 .
- the invention can also be embodied as computer readable code on a computer readable recording medium.
- the computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of computer readable recording mediums include read-only-memory (ROM), random-access memory(RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet).
- ROM read-only-memory
- RAM random-access memory
- CD-ROMs compact discs, digital versatile discs, digital versatile discs, and Blu-rays, etc.
- magnetic tapes such as magnetic tapes
- floppy disks such as magnetic tapes
- optical data storage devices such as data transmission through the internet
- carrier waves such as data transmission through the internet.
- the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
- functional programs, code, and code segments for accomplishing the present invention can be easily
- the present invention is applicable to any image forming apparatus that prints an image using two print heads that are positioned a predetermined distance apart.
- the distance between two thermal print heads is accurately measured using two patterns that the thermal print heads print by simultaneously applying heat to a medium, and the alignment of the image forming apparatus is conveniently and precisely adjusted using the measured distance between the thermal print heads. Accordingly, optimum print quality can be achieved.
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Abstract
Description
Claims (18)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2005-0004147 | 2005-01-17 | ||
KR1020050004147A KR20060084127A (en) | 2005-01-17 | 2005-01-17 | Method and apparatus for adjusting alignment of image forming device |
Publications (2)
Publication Number | Publication Date |
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US20060158505A1 US20060158505A1 (en) | 2006-07-20 |
US7477273B2 true US7477273B2 (en) | 2009-01-13 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/332,314 Expired - Fee Related US7477273B2 (en) | 2005-01-17 | 2006-01-17 | Method and device for adjusting alignment of image forming apparatus |
Country Status (3)
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US (1) | US7477273B2 (en) |
KR (1) | KR20060084127A (en) |
CN (1) | CN100532107C (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7508404B2 (en) * | 2006-12-21 | 2009-03-24 | Eastman Kodak Company | Thermal printer with two print heads |
US7675534B2 (en) * | 2006-12-22 | 2010-03-09 | Eastman Kodak Company | Printer with short print-to-print cycle times |
US9325860B2 (en) * | 2010-12-01 | 2016-04-26 | Quadtech, Inc. | Line color monitoring system |
CN102848737B (en) * | 2011-06-27 | 2015-03-11 | 山东新北洋信息技术股份有限公司 | Printer and printing control method |
US8477165B2 (en) * | 2011-11-21 | 2013-07-02 | Electronics For Imaging, Inc. | Method and apparatus for thermal expansion based print head alignment |
KR20170004305A (en) * | 2015-07-02 | 2017-01-11 | 에스프린팅솔루션 주식회사 | Image forming apparatus, controlling method of thereof and non-transitory computer readable storage medium |
WO2017196339A1 (en) * | 2016-05-12 | 2017-11-16 | Hewlett-Packard Development Company, L.P. | Fuse lamp calibration |
WO2018112683A1 (en) * | 2016-12-19 | 2018-06-28 | Intel Corporation | Manufacturing a touch sensor |
CN106739546B (en) * | 2017-01-14 | 2019-03-05 | 青岛瀚泽电气有限公司 | Duplex printer |
WO2019034918A1 (en) * | 2017-08-18 | 2019-02-21 | Drylock Technologies Nv | Inline high-speed manufacturing and printing of absorbent products |
CN115771259B (en) * | 2022-10-31 | 2023-05-12 | 北京工商大学 | Online coloring cooperative control method and system for 3D printing |
Citations (7)
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JPS5769066A (en) | 1980-10-16 | 1982-04-27 | Fuji Xerox Co Ltd | Control system of perfect printer |
JPH0811309A (en) | 1994-06-30 | 1996-01-16 | Xerox Corp | Electronic automatic correction of segment printing bar in improper alignment |
JP2000127360A (en) | 1998-10-23 | 2000-05-09 | Canon Inc | Recorder and print position correcting method |
JP2001199055A (en) | 2000-01-18 | 2001-07-24 | Copyer Co Ltd | Ink jet image forming apparatus |
JP2002036612A (en) | 2000-07-31 | 2002-02-06 | Shinko Electric Co Ltd | Method for correcting print position |
JP2002144613A (en) | 2000-11-09 | 2002-05-22 | Nec Viewtechnology Ltd | Circuit for aligning print position of a plurality of thermal heads |
CN1521002A (en) | 2003-02-14 | 2004-08-18 | 三星电子株式会社 | Method of calibrating print alignment error |
-
2005
- 2005-01-17 KR KR1020050004147A patent/KR20060084127A/en not_active Application Discontinuation
-
2006
- 2006-01-17 US US11/332,314 patent/US7477273B2/en not_active Expired - Fee Related
- 2006-01-17 CN CNB2006100050735A patent/CN100532107C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5769066A (en) | 1980-10-16 | 1982-04-27 | Fuji Xerox Co Ltd | Control system of perfect printer |
JPH0811309A (en) | 1994-06-30 | 1996-01-16 | Xerox Corp | Electronic automatic correction of segment printing bar in improper alignment |
JP2000127360A (en) | 1998-10-23 | 2000-05-09 | Canon Inc | Recorder and print position correcting method |
JP2001199055A (en) | 2000-01-18 | 2001-07-24 | Copyer Co Ltd | Ink jet image forming apparatus |
JP2002036612A (en) | 2000-07-31 | 2002-02-06 | Shinko Electric Co Ltd | Method for correcting print position |
JP2002144613A (en) | 2000-11-09 | 2002-05-22 | Nec Viewtechnology Ltd | Circuit for aligning print position of a plurality of thermal heads |
CN1521002A (en) | 2003-02-14 | 2004-08-18 | 三星电子株式会社 | Method of calibrating print alignment error |
KR20040073730A (en) | 2003-02-14 | 2004-08-21 | 삼성전자주식회사 | Calibrating method of print alignment error |
Also Published As
Publication number | Publication date |
---|---|
US20060158505A1 (en) | 2006-07-20 |
KR20060084127A (en) | 2006-07-24 |
CN100532107C (en) | 2009-08-26 |
CN1807103A (en) | 2006-07-26 |
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